性能增强再生混凝土框架结构模型双向模拟振动台试验

发布时间：2018-07-03 17:23

本文选题：再生混凝土 + 性能增强　；参考：《土木工程学报》2015年12期

【摘要】：基于课题组前期有关性能增强再生混凝土(EC-RAC)基本材性、构件等试验结果,设计并制作了一缩尺比例为1:4的3层含有多种类再生混凝土的框架结构模型,并进行了双向模拟振动台试验研究,得到了该框架结构模型的自振频率、阻尼比、结构振型、加速度响应、位移响应、层间位移角等变化规律,结果表明:EC-RAC相较于普通RAC能够较好的控制裂缝的出现与发展,从而改善结构的延性,提高结构的整体抗震性能;随着地震烈度的逐渐增加,结构损伤累积,自振频率逐渐降低、阻尼比逐渐增大、加速度放大系数亦逐渐降低、位移幅值逐渐增大,同时位移幅值的曲线形式与结构第一振型相近,表明结构振动时以第一振型为主;模型经历了七度多遇至八度罕遇各地震作用后,层间位移角均未超过规范~[12]中所规定的1/50,上述试验结果均表明,所设计的RAC框架具有良好的抗震性能,完全满足规范~[12]中的要求。最后,参考《建筑地震破坏等级划分标准》、《建筑抗震设计规范》(GB 50011—2010)等文献,同时考虑各阶段试验现象,建立了能够应用于实际RAC结构震后破坏等级定量评估的5级划分。
[Abstract]:Based on the experimental results of performance enhancement of recycled concrete (EC-RAC), a three-layer frame structure model with a scale of 1:4 is designed and made. The self-vibration frequency, damping ratio, vibration mode, acceleration response, displacement response and inter-story displacement angle of the frame structure model are obtained. The results show that the emergence and development of cracks can be controlled better by comparing with the common RAC, and the ductility of the structure can be improved, and the seismic performance of the whole structure can be improved, and with the increasing of seismic intensity, the damage of the structure accumulates and the natural vibration frequency decreases gradually. The damping ratio increases gradually, the acceleration magnification coefficient decreases gradually, the displacement amplitude increases gradually, and the curve form of the displacement amplitude is close to the first vibration mode of the structure, which indicates that the first vibration mode is the main mode in the vibration of the structure. After several earthquakes, the displacement angle of the floor is less than 1 / 50 specified in the code ~ [12]. The experimental results show that the designed RAC frame has good seismic performance. Fully meet the requirements of specification ~ [12]. Finally, referring to the documents such as the Standard of earthquake damage rating for buildings and the Code for Seismic Design of buildings (GB50011-2010), and taking into account the experimental phenomena in various stages, a magnitude 5 partition which can be applied to the quantitative evaluation of the damage grade of real RAC structures after earthquake is established.
【作者单位】：长安大学;西安建筑科技大学;
【基金】：国家自然科学基金(51178388,51008245) 陕西省教育厅重点实验室科研计划项目(12JS055,13JS050)、陕西省教育厅自然专项(2013JK0612) 陕西省工业攻关项目(2013K07-07)
【分类号】：TU311.3;TU37

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